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Grain growth of nanocrystalline cryomilled Fe-Al powders

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Abstract

Nanocrystalline Fe-xAl (x=0, 2.6, or 10 wt pct) powders have been prepared using cryogenic mechanical alloying (cryomilling). The extremely low rate of diffusion of Al in Fe at the process temperature (−196 °C) effectively limits dissolution of Al in the nanocrystalline αFe grains. Thermal stability against grain growth in the cryomilled Fe-Al mixtures is found to be much greater than that of identically prepared pure nanocrystalline Fe. Heat treatment of the cryomilled Fe-Al materials results in a highly inhomogeneous distribution of grain size and microchemistry. The observed thermal stability is evaluated in terms of Zener pinning, solute drag, and chemical ordering mechanisms.

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Author notes

  1. R. J. Perez (Postdoctoral Student, Technical Staff Member) & H. G. Jiang (Postdoctoral Student, Research Associate)

    Present address: the Department of Chemical Engineering and Materials Science, University of California, Irvine, 92697-2575, Irvine, CA

Authors and Affiliations

  1. Material & Processes Engineering Space System Division, Boeing, Downey, CA

    R. J. Perez (Postdoctoral Student, Technical Staff Member)

  2. Los Alamos National Laboratory, Los Alamos, NM

    H. G. Jiang (Postdoctoral Student, Research Associate)

  3. the Department of Chemical Engineering and Materials Science, University of California, Irvine, 92697-2575, Irvine, CA

    E. J. Lavernia (Professor and Chair)

  4. the United States Bureau of Mines, 97321-2198, Albany, OR

    C. P. Dogan (Researcher)

Authors
  1. R. J. Perez
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  2. H. G. Jiang
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  3. E. J. Lavernia
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  4. C. P. Dogan
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Perez, R.J., Jiang, H.G., Lavernia, E.J. et al. Grain growth of nanocrystalline cryomilled Fe-Al powders. Metall Mater Trans A 29, 2469–2475 (1998). https://doi.org/10.1007/s11661-998-0218-7

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  • DOI: https://doi.org/10.1007/s11661-998-0218-7

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